I. adjective suffix also -n Etymology: Middle English, from Old English; akin to Old High German -īn made of, Latin -īnus of or belonging to, Greek -inos made of, of or belonging to made of ; consisting of
Example: earthen
Example: leathern II. verb suffix Etymology: Middle English -nen, from Old English -nian; akin to Old High German -inōn -en 1. a. cause to be
Example: sharpen b. cause to have
Example: lengthen 2. a. come to be
Example: steepen b. come to have
Example: lengthen

Merriam-Webster's Collegiate Dictionary